轧制纯钛板预变形后拉伸载荷下的力学行为及变形机理

IF 6.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Chao Ma, Lu Shen, Shudong Yang, Zhiang Li, Yao Cheng, Lingyu Zhao, Xiaoqian Guo
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引用次数: 0

摘要

采用宏观力学测试、显微组织表征和晶体塑性模拟等方法,通过预变形(压缩和拉伸)引入位错和{10-12}扩展孪晶,对轧制后的纯钛(CP-Ti)板材在后续拉伸载荷下的力学行为和变形机理进行了全面研究。预变形明显提高了屈服应力,减弱了后续拉伸过程中的应变硬化行为。预变形后,棱柱滑移的相对活动性降低,基底滑移和伸展孪晶被激活。特别是,预压缩比预拉伸更容易激活棱柱滑移,而预拉伸更有利于激活延伸孪晶。孪晶和脱晶行为是影响CP-Ti后续拉伸过程中力学行为变化和织构演化的关键因素。应变路径改变后,观察到三种主要孪晶行为。在预拉伸试样中,发现了{10-12}扩展孪晶的形核、{11-22}收缩孪晶的去孪生和{11-22}-{10-12}次生孪晶的形成。预压缩试样激活了{10-12}扩展孪晶的形核、{10-12}扩展孪晶的去孪晶和{10-12}-{11-22}次生孪晶的形成。预孪生和预位错的密度越大,孪晶行为越明显。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mechanical behavior and deformation mechanisms of rolled commercially pure titanium sheet under tensile loading after pre-deformation
Introducing dislocations and {10-12} extension twins through pre-deformation (compression and tension), the mechanical behavior and deformation mechanisms of the rolled commercially pure titanium (CP-Ti) sheet under subsequent tensile loading is comprehensively investigated by means of macroscopic mechanical testing, microstructural characterization, and crystal plasticity simulation. The pre-deformation enhances obviously the yield stress, while weakens the strain hardening behavior during subsequent tension. The relative activity of prismatic slip is reduced after pre-deformation, but more basal slip and extension twinning get activated. Especially, the prismatic slip is more easily activated after pre-compression compared to pre-tension, whereas pre-tension is more favorable to activate extension twinning. Twinning and detwinning behaviors are the key factors in contributing to the changes in mechanical behavior and texture evolution during subsequent tension of CP-Ti. After strain path change, three primary twinning behaviors are observed. In pre-tension samples, nucleation of {10-12}extension twin, detwinning of {11-22} contraction twin, and formation of {11-22}-{10-12} secondary twin are discovered. However, pre-compression samples activate the nucleation of {10-12} extension twin, detwinning of {10-12} extension twin, and formation of {10-12}-{11-22} secondary twin. The higher density of pre-twins and pre-dislocations leads to more obvious detwinning behavior.
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来源期刊
Journal of Alloys and Compounds
Journal of Alloys and Compounds 工程技术-材料科学:综合
CiteScore
11.10
自引率
14.50%
发文量
5146
审稿时长
67 days
期刊介绍: The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.
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